The weather agency issued a special weather statement early Monday afternoon for parts of southern Ontario including Toronto. It called for heavy localized flooding.

Just before 6 p.m., a severe thunderstorm warning was issued for Toronto, Vaughan, Richmond Hill, Markham, Mississauga and Brampton.

King and Atlantic Ave. in Toronto closed due to flooding July 8, 2013.

Phil Pang/Global News

A woman checks her car in flood water on Lakeshore West during a storm in Toronto on Monday, July 8, 2013. THE CANADIAN PRESS/Frank Gunn

THE CANADIAN PRESS/Frank Gunn

A woman walks back to her flooded car after discovering that the firetruck behind her had suffered the same fate on the Toronto Indy course on Lakeshore Boulevard in Toronto on Monday, July 8 2013. THE CANADIAN PRESS

THE CANADIAN PRESS

A woman gets gets back in her car in flood water on Lakeshore West during a storm in Toronto on Monday, July 8, 2013. THE CANADIAN PRESS/Frank Gunn

THE CANADIAN PRESS/Frank Gunn

Museum subway station flooding on July 8, 2013.

Cindy Pom/Global News

Fire crews trying to get people out of a stuck GO Train in Toronto on July 8, 2013.

Lama Nicolas/Global News

GO Train stuck after heavy rain in Toronto on July 8, 2013.

Lama Nicolas/Global News

People walking during major storm in Toronto on July 8, 2013.

Jeremy Cohn/Global News

Flooding on the Don Valley Parkway in Toronto on July 8, 2013. (Adam Dabrowski/Global News)

Adam Dabrowski/Global News

Flooding near Keele and Lawrence in Toronto July 8, 2013.

Brent Rose/Global News

Flooding on the GO Train July 8, 2013.

Travers Chow

Flooding on the GO Train July 8, 2013.

Travers Chow

People walking with their shoes off during flooding in Toronto on July 8, 2013.

Jeremy Cohn/Global News

Christie Pitts after a heavy rain storm July 8, 2013.

David Skok/Global News

Christie Pitts after a heavy rain storm July 8, 2013.

David Skok/Global News

Flooding on Bay St. in Toronto on July 8, 2013.

Jeremy Cohn/Global News

Flooding on the GO Train July 8, 2013.

Travers Chow

Flooding on the GO Train July 8, 2013.

Travers Chow

The DVP submerged after heavy rain July 8, 2013.

Jeremy Cohn/Global News

A tow truck driver floats a car out of the Don Valley Parkway in Toronto on Monday, July 8 2013. (THE CANADIAN PRESS)

Watch: Raw video of people being rescued from the flooded GO Train.

Police and firefighters used small inflatable boats to ferry all passengers from the Richmond Hill-bound train a short distance to higher ground. It took until about 12:30 a.m. to complete the operation, about seven hours after it began.

WATCH: Passengers talk about being rescued after their commuter GO Train grounded to a halt when heavy rain flooded the tracks on Monday.

Emergency officials said five or six people were treated at the scene for minor injuries during the operations and none required hospitalization.

Watch: Mississauga was hit as a record-setting storm rolled through the GTA. Cindy Pom reports.

Mississauga, a city of more than 700,000, saw some of the worst of the blackouts with 80 per cent of the community plunged into the dark, according to power distributor Enersource. By around 10 p.m., only about 50,000 were without power.

Power was fully restored around 4 a.m.

In York Region, PowerStream Inc. said 20,000 customers were knocked off the grid in Markham and Richmond Hill. Power was restored just after 10 p.m.

Environment Canada is calling for more rain Tuesday with a risk of thunderstorms in the afternoon.